Symptoms of a failed wax ring
(1) Water seeps around the toilet base after flushing — usually visible as a ring of moisture or buckled flooring; (2) sewer-gas smell at floor level near the toilet; (3) toilet rocks slightly when you sit; (4) ceiling stain or wet drywall in the room directly below the toilet.
Step 1: Diagnose first — is it the wax ring or something else?
Wax-ring failure usually shows water at the base only during/after a flush, not continuously. If water is continuous, it\'s a tank-to-bowl gasket (two-piece only), supply-line connection, or angle-stop leak — not the wax ring. Dry the base thoroughly, then flush and watch where water emerges.
Tools and parts
- Wax ring with horn (Fluidmaster 7530, $5; or "Wax-Free" foam ring from Korky if you prefer no-wax, $8)
- New closet bolts and washers (the old ones are usually corroded)
- Putty knife
- Sponge and bucket
- Adjustable wrench
- Old towel and trash bag (for the old wax)
- Caulk gun + 100% silicone caulk (optional, for re-sealing base)
Step 2: Shut off water and drain the toilet
Close the angle stop, flush, sponge tank and bowl dry. Disconnect the supply line.
Step 3: Remove the toilet
Pop the bolt caps at the base, unscrew the closet bolt nuts. If bolts are rusted/spinning, cut with a hacksaw between the porcelain base and the wing nut. Rock the toilet gently side-to-side to break any caulk seal at the floor. Lift straight up — use your knees, not your back; one-piece toilets weigh 90-110 lbs.
Step 4: Scrape off old wax
The old wax ring is now smashed across the flange and the toilet horn. Use a putty knife to scrape every bit of wax off both surfaces — wax left behind compromises the new seal. Inspect the flange: if cracked, broken at a bolt slot, or rusted (cast iron), you need to replace the flange as well (see our flange replacement guide).
Step 5: Install new closet bolts
Drop new 5/16" brass closet bolts into the flange slots, with the plastic retainer washers on top to hold them upright.
Step 6: Place the wax ring
Set the wax ring on the flange — wax side up, plastic horn pointing into the drain. Many plumbers prefer to set the ring on the bottom of the toilet horn instead. Both work; the flange-side placement is more forgiving for first-timers.
Step 7: Set the toilet
Lift the toilet, align the closet bolts through the base holes, lower straight down onto the wax. Press down with your full body weight — sit on it if needed — to compress the wax fully. Do not rock or twist; both break the wax seal and you\'ll have to start over with a new ring.
Step 8: Tighten bolts evenly
Hand-tighten the wing nuts alternately. Then wrench-tighten 1/4 turn at a time, alternating sides. Stop the moment the toilet is firm against the floor. Over-tightening cracks the porcelain at the base — irrecoverable.
Step 9: Reconnect supply, fill, test
Reattach supply line, open angle stop, fill tank, flush 3 times while watching the base. No moisture = success. If you see water: the wax didn\'t seal — pull and reset with a new ring (don\'t reuse).
Step 10: Caulk the base (optional)
Run a bead of 100% silicone caulk around the base perimeter. Leave a 2-inch gap at the back so any future leak is visible at the floor rather than hidden under caulk.